. To construct a ray diagram we use two light rays which are so chosen that it is easy to know their directions after reflection from the mirror
List these two rays and state the path of these rays after reflection. Use these two rays to locate the image of an object placed between infinity and the centre of curvature of a concave mirror.
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Ans.The rays for obtaining image from the mirror after reflection are so chosen that it is easy to know their directions after reflection from the mirror.
(i) A ray parallel to the principal axis, after reflection passes through the focus in concave mirror or appears to pass through the focus in convex Focus in mirror.
(ii) A ray passing through the principal focus of a concave mirror or directed towards the principal focus in convex mirror after reflection will emerge parallel to the principal axis.
(iii) A ray passing through the centre of curvature of the-concave mirror or directed in the direction of the centre of curvature of
the convex mirror is reflected back along the same path after reflection.
When the object is placed between infinity and the centre of curvature of a concave mirror.
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